Maxima Function
deftaylor (f_1(x_1), expr_1, ..., f_n(x_n), expr_n)
For each function f_i of one variable x_i,
deftaylor defines expr_i as the Taylor series about zero.
expr_i is typically a polynomial in x_i or a summation;
more general expressions are accepted by deftaylor without complaint.
powerseries (f_i(x_i), x_i, 0)
returns the series defined by deftaylor.
deftaylor returns a list of the functions
f_1, ..., f_n.
deftaylor evaluates its arguments.
Example: